Editors' ChoiceNeuroscience

A Pathway That Controls Our Mood

Science Signaling  23 Sep 2014:
Vol. 7, Issue 344, pp. ec259
DOI: 10.1126/scisignal.2005926

A brain area called the lateral habenula is involved in negative motivation and may thus play a role in depression. Shabel et al. investigated synaptic transmission in a brain pathway to the lateral habenula that transmits disappointment signals. Surprisingly, they found the simultaneous release of two antagonistic substances, glutamate and GABA, from individual nerve cells. In an animal model of depression, GABA release was reduced in this pathway. A widely used antidepressant drug, however, increased GABA co-release. These results reveal an unusual synaptic mechanism that affects lateral habenula activity. This mechanism may be instrumental in regulating the emotional impact of disappointment.

S. J. Shabel, C. D. Proulx, J. Piriz, R. Malinow, GABA/glutamate co-release controls habenula output and is modified by antidepressant treatment. Science 345, 1494–1498 (2014). [Abstract] [Full Text]